<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.24.0/axios.min.js"></script>

<body>
    <button id="btn">刷新所有客户端</button>
</body>
<script>
    document.querySelector('#btn').onclick = function () {
        // 发请求,刷新所有客户端
        axios.get('http://localhost:3000/reload')
    }
</script>

</html>